Acoustic phonon softening and lattice instability driven by on-site $f$-$d$ hybridization in CeCoSi
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866911712215564288 |
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| author | Matsumura, Takeshi Hasegawa, Takumi Nakajima, Ryuma Kurauchi, Kenshin Tsutsui, Satoshi Ishikawa, Daisuke Baron, Alfred Q. R. Tanida, Hiroshi |
| author_facet | Matsumura, Takeshi Hasegawa, Takumi Nakajima, Ryuma Kurauchi, Kenshin Tsutsui, Satoshi Ishikawa, Daisuke Baron, Alfred Q. R. Tanida, Hiroshi |
| contents | Soft phonon modes in tetragonal CeCoSi, which undergoes a structural transition at $T_0=12$ K followed by antiferromagnetic order at $T_{\text{N}}=9.5$ K, have been investigated using high-resolution inelastic x-ray scattering. Pronounced softening was detected in the transverse acoustic modes corresponding to the $(yz+zx)$-type monoclinic distortion, consistent with the experimentally determined triclinic structure. Remarkably, the softening persists up to the zone boundary along (0, 0, $q$), indicating a short correlation length of the lattice instability. This instability, characterized by a Curie-type strain susceptibility, is interpreted as a consequence of the on-site $4f$-$5d$ hybridization, which is intrinsic to this crystal structure due to the lack of inversion symmetry at the two Ce sites. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_14216 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Acoustic phonon softening and lattice instability driven by on-site $f$-$d$ hybridization in CeCoSi Matsumura, Takeshi Hasegawa, Takumi Nakajima, Ryuma Kurauchi, Kenshin Tsutsui, Satoshi Ishikawa, Daisuke Baron, Alfred Q. R. Tanida, Hiroshi Strongly Correlated Electrons Soft phonon modes in tetragonal CeCoSi, which undergoes a structural transition at $T_0=12$ K followed by antiferromagnetic order at $T_{\text{N}}=9.5$ K, have been investigated using high-resolution inelastic x-ray scattering. Pronounced softening was detected in the transverse acoustic modes corresponding to the $(yz+zx)$-type monoclinic distortion, consistent with the experimentally determined triclinic structure. Remarkably, the softening persists up to the zone boundary along (0, 0, $q$), indicating a short correlation length of the lattice instability. This instability, characterized by a Curie-type strain susceptibility, is interpreted as a consequence of the on-site $4f$-$5d$ hybridization, which is intrinsic to this crystal structure due to the lack of inversion symmetry at the two Ce sites. |
| title | Acoustic phonon softening and lattice instability driven by on-site $f$-$d$ hybridization in CeCoSi |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.14216 |